The voice came from an oblong metal plaque like a dulled mirror which formed part of the surface of the right-hand wall.

Any sound that Winston made, above the level of a very low whisper, would be picked up by it, moreover, so long as he remained within the field of vision which the metal plaque commanded, he could be seen as well as heard.

There are no more uses of "plaque" in the book.

Show samples from other sources

His scarcely revived memories couldn’t quite grasp what it meant, but he’d first seen it on the metal plaque back in the Maze, the one that had spelled out the words that made up WICKED’s acronym.

James Dashner -- The Scorch Trials

A plaque beside the door declared that the space was actually titled the Newsome Library, but I’d never heard anyone call it by that name except for Mom on occasion.